In the 70s I did metalwork in high school. The teacher who we all really liked, stood over us providing guidance dropped cigarette ash onto our work.

For the whole year most of the projects we made were a range of ashtrays. I got good marks.

I did managed to avoid being influenced by smoking.

One of our wood-turning projects was an ashtray.

Metal work project was a cigarette case for 50 smokes.

Yes, both teachers smoked.